Filter

Abstract

The present invention provides a filter. The filter includes two common electrode layers and two inner electrode layers, where the two inner electrode layers are located between the two common electrode layers, and an electrical insulation layer is disposed between any two adjacent electrode layers of the two common electrode layers and the two inner electrode layers; each of the two common electrode layers is connected to at least one grounding electrode; and each of the two inner electrode layers is connected to at least one signal electrode. The filter provided by embodiments of the present invention can perform filtering processing on low-frequency noise such as that of a direct current power supply, and has a good filtering processing effect.

What is claimed is: 
     
       1. A filter, comprising:
 two common electrode layers and two inner electrode layers, wherein the two inner electrode layers are located between the two common electrode layers, and an electrical insulation layer is disposed between any two adjacent electrode layers of the two common electrode layers and the two inner electrode layers; 
 wherein each of the two common electrode layers is connected to at least one grounding electrode; 
 wherein each of the two inner electrode layers is connected to at least one signal electrode, and 
 wherein each of the two inner electrode layers comprises: a main zone and two extended zones that extend outwards along an edge of the main zone, the two extended zones are disposed on two opposite sides or at two opposite corners of the main zone and are symmetric to a center of the main zone; and 
 wherein the two extended zones of one of the two inner electrode layers do not overlap the two extended zones of the other of the two inner electrode layers in a direction perpendicular to a plane where the two inner electrode layers are located. 
 
     
     
       2. The filter according to  claim 1 , wherein each of the two inner electrode layers is electrically connected to the respective at least one signal electrode by a corresponding dock connector used for inputting or outputting a current. 
     
     
       3. The filter according to  claim 2 , wherein the respective dock connectors of the two inner electrode layers are staggered from each other, and a respective current direction of the two inner electrode layers is different from each other. 
     
     
       4. The filter according to  claim 1 , wherein:
 each of the two opposite corners at one inner electrode layer of the two inner electrode layers is disposed with a dock connector; and 
 each of the two opposite corners that are at the other inner electrode layer of the two inner electrode layers is disposed with a dock connector. 
 
     
     
       5. The filter according to  claim 1 , wherein each extended zone forms a dock connector for the respective inner electrode layer. 
     
     
       6. The filter according to  claim 5 , wherein the main zones of the two inner electrode layers are rectangles. 
     
     
       7. The filter according to  claim 1 , wherein the two common electrode layers each comprise a common main zone and a common extended zone that extends outward along an edge of the respective common main zone, and each common extended zone forms a dock connector that is at the respective common electrode layer and electrically connected to the at least one grounding electrode. 
     
     
       8. The filter according to  claim 7 , wherein the common extended zones of the two common electrode layers overlap in a direction perpendicular to a plane where the common main zones are located. 
     
     
       9. The filter according to  claim 7 , wherein the common main zones of the two common electrode layers are rectangles, and each of the two common electrode layers is disposed with two common extended zones. 
     
     
       10. A filter, comprising:
 three common electrode layers and two pairs of inner electrode layers, wherein each pair of inner electrode layers comprises two inner electrode layers; 
 wherein the three common electrode layers comprise a first common electrode layer, a second common electrode layer, and a third common electrode layer, wherein a first pair of the two pairs of inner electrode layers is located between the first common electrode layer and the second common electrode layer, a second pair of the two pairs of inner electrode layers is located between the second common electrode layer and the third common electrode layer, and an electrical insulation layer is disposed between each two adjacent electrode layers of the three common electrode layers and the two pairs of inner electrode layers; 
 wherein each of the three common electrode layers is connected to at least one grounding electrode, and each inner electrode layer of the two pairs of inner electrode layers is connected to at least one signal electrode; 
 wherein each of the two inner electrode layers of the first pair of inner electrode layers comprises: a the main zone, the two extended zones two extended zones that extend outwards along an edge of the main zone, the two extended zones are disposed on two opposite sides or at two opposite corners of the main zone and are symmetric to a center of the main zone; and 
 wherein the two extended zones of one of the two inner electrode layers of the first pair do not overlap the two extended zones of the other of the two inner electrode layers of the first pair in a direction perpendicular to a plane where the two inner electrode layers are located. 
 
     
     
       11. The filter according to  claim 10 , wherein, each of the two inner electrode layers in the first pair of inner electrode layers is disposed with a dock connector that is electrically connected to a signal electrode and used for inputting or outputting a current. 
     
     
       12. The filter according to  claim 11 , wherein the dock connectors of the two inner electrode layers of the first pair of inner electrode layers are staggered from each other, and a respective current direction of the two inner electrode layers of the first pair of inner electrode layers is different from each other.